Molecular detection device

A molecular detection device is related. The device includes a carrier, a detector and a control computer. The carrier includes a substrate, a middle layer and a metal layer. The middle layer is sandwiched between the substrate and the middle layer. The detector is configured to detect molecules on a surface of the carrier. The control computer is connected to the detector and configured to analyze a detection result. The middle layer includes a base and a patterned bulge on the base, and the patterned bulge includes a plurality of strip-shaped bulges, the metal layer is on the patterned bulge.